As I always say, coating is in the eye of the customer. The best resource I
can recommend to you is the IPC-hdbk-830

Areas to be coated:
a. All surface *conductors* on the printed board should be coated.
b. All exposed solder joints and component *leads* should be coated.
c. Bare board areas with no traces or joints are not necessary to coat, but
may be considered optional, if for cosmetic purposes only.
d. If component packaging requires coating, it should be specified in the
design.
NOTE: Coating for *cosmetic* reasons may adversely affect assembly cycle
time and usage cost.

A big "thank you" from a coater to Doug Pauls, Fonda Wu, et al. for the
work they put into the new handbook. It makes it much easier to discuss
coating with customers.

Lloyd Duso
Diamond-MT
Plant Manager
(814) 535-3505
www.Diamond-mt.com


On Fri, Mar 14, 2014 at 4:01 AM, Çetin Yeğin <[log in to unmask]> wrote:

> Dear All,
>
> We have a confusion about conformal coating area. Our quality department
> rejects some boards because edges of some high components were not coated.
> These edges are non-conductive and I think there is no need to coat
> non-conductive areas. IPC-A-610 10.5.2 says that "Conformal coatings should
> be transparent, uniform in color and consistency and uniform cover the
> board and components".
>
> 1.       Does it mean we have to coat all areas unless specified in design
> document?
>
> 2.       Is there any requirement to coat non-conductive areas?
>
> 3.       Do we have to coat non-conductive areas of components?
>
>
> Thanks.
>
> Best Regards
>
> Çetin YEĞİN
> Senior Engineer
>
> ASELSAN A.S. \ ASELSAN INC.
> Microelectronics, Guidance and Electro-Optics Division (MGEO) Çankırı
> Yolu, 7. km, 06750 AKYURT, ANKARA, TURKEY
> Phone: +90 (312) 847 53 00 Ext:4071
> Fax: +90 (312) 847 53 20
>
>
> ______________________________________________________________________
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